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Just took deivery on a 2010 Cobalt 1LT. Want to take out the factory oil and use MOBIL 1 Full Synthetic extended service. The factory oil is regular. I know 4 cyl's work much harder than 6's or 8's. Will using the synthetic 5W30 be a more than good oil to use?
 

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Wootsauce!
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Welcome to the forum.

I ran the regular oil for about 5000 miles before I switched to synthetic.

I use Mobil 1 5w-30 full synthetic in my '09 LS 2.2
 

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used regular for the first 20k mi. Now I'm switching to full synthetic as I am working the engine a bit harder now, and want to get something that'll stay clean longer.
 

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Not justice...Punishment
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Stay with the regular oil at least until the first normal oil change. Your engine needs time to properly break in. After that I would switch.



By the way.... Welcome, and congrats on the new balt.
 
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